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저비용 6축 IMU센서를 이용한 양치구역 추정을 위한 기계학습 모델 개발
권민욱,임대연,김도윤,류승재,조은아,김영욱,김진현 대한전기학회 2024 전기학회논문지 Vol.73 No.2
The recent epidemic of respiratory diseases has underscored the importance of personal oral health care. Oral diseases, primarily caused by viral infections, can be reduced by regularly eliminating oral microorganisms. Effective tooth brushing is fundamental to oral health, but changing established brushing habits can be challenging. Adherence to recommended brushing techniques is challenging across all age groups, including children, older people, and adults. This study uses data from a low-cost, 6-axis IMU sensor and a machine learning-based classification algorithm for 13 brushing positions. We evaluate eight machine learning models using the sensor’s acceleration and angular velocity data and assess their performance using various metrics. Our results show that these models can classify brush positions with approximately 89% accuracy. This method enables monitoring of brushing areas and analysis of brushing patterns to improve brushing quality and adherence to recommended techniques. Consequently, by improving brushing quality, it is possible to maintain primary personal oral care and prevent various diseases.
자이로 센서 데이터를 활용한 양치 위치 추정 및 비지도 학습 클러스터링을 통한 검증
김도윤,권민욱,백승주,윤혜린,임대연,조은아,류승재,김영욱,김진현 한국정보과학회 2023 정보과학회논문지 Vol.50 No.12
Oral health is an important health indicator that is directly related to longevity. For this reason, oral health has become a key component of public health, from infants to the elderly. The foundation of good oral health is good brushing habits. However, the recommended correct brushing method is not easy to adopt, and this harms oral health. This paper proposes a method to distinguish brushing zones using low-cost IMU sensors to track the correct brushing method. We evaluated the accuracy of the brushing zone estimation method using clustering algorithms in machine learning. In this paper, we propose a method for determining the brushing area based on toothbrush posture alone using the gyro sensor of an IMU sensor. In this paper, we propose a method for determining the brushing area using only the gyro sensor of an IMU sensor based on toothbrush posture. We showed that relatively inexpensive 6-axis IMU gyro sensor data could be used to estimate the user’s brushing area with an accuracy of 80.6%. In addition, we applied a clustering algorithm to these data and trained a logistic regression model using the clustered data to estimate the brushing area. The result was obtained with an accuracy of 86.7%, showing that clustering was effective and that the toothbrush posture-based brushing area estimation proposed in this paper was effective. In conclusion, it is expected that the brushing zone estimation algorithm can be implemented as a function of a relatively low-cost toothbrush and that it can help to maintain oral health by analyzing and improving personal brushing habits.
파일롯 규모 전기투석 막여과 시스템을 이용한 비소와 망간오염 지하수 처리
최수영 ( Su Young Choi ),권민욱 ( Min Wook Kwon ),박기영 ( Ki Young Park ),차호영 ( Ho Young Cha ),김희준 ( Hee Jun Kim ),권지향 ( Ji Hyang Kweon ) 한국물환경학회(구 한국수질보전학회) 2017 한국물환경학회지 Vol.33 No.3
A pilot-scale electrodialysis system was designed and constructed to treat groundwater polluted with arsenic and manganese. Synthetic groundwater, in which some amount of arsenic (As) and manganese (Mn) were added to a final concentration of 500 mg/L of Mn and 50 pg/L of As, was used as a feed for the ED system. The limiting current density, linear water velocity, applied voltage, and membrane surface area were investigated to obtain the efficient and economic operation of the ED system. The linear water velocity increased from 0.74 cm/s to 1 lcm/s, based on the evaluation of limiting current density. Using the ED system with 14 pairs of ion exchange membranes, the water quality of the diluate after 85 minutes of operation satisfied the water quality criteria for drinking water. Increasing the membrane pairs to 21 and 42 pairs was effective in reducing the conductivities of the diluate. The operation cost of the ED system was assessed using specific energy consumption, which was 1.065~ 1.2 kWli/m3. Considering low salt concentrations of the groundwater, increases in current utilization and low voltage applications are required when the ED system is used to produce drinking water.